llama.swiftui : load downloaded models

[bachittle]

Prerequisites

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• I am running the latest code. Development is very rapid so there are no tagged versions as of now.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new bug or useful enhancement to share.

Issue

After adding #4483, tried it out and the benchmarking works well, as well as the download mechanic. The only issue is it does not load after downloading. Should be an easy fix as the LlamaState just needs to be reloaded with a new defaultModelUrl.

[ggerganov]

The idea is to click again on the model to load it. Seemed more intuitive to me, but we can change if you think it is not clear.

[bachittle]

oh ok that works. i was just expecting it to load once it was done downloading, or have a separate button for loading, but i think that will be fine. this is mostly just to get it working in the simulator anyways.